Subwoofer loudspeaker



FIG. 1 is a top, front and right-side perspective view of a subwoofer loudspeaker showing our new design;

FIG. 2 is an enlarged front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof, the left-side being a mirror image thereof; and,

FIG. 5 is a top plan view thereof, the bottom thereof being void of ornamentation. 

The ornamental design for a subwoofer loudspeaker, as shown and described. 